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The Solar SystemThe Solar System
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Essential QuestionsEssential Questions
�� What are planets?What are planets?
�� What are the types of planets?What are the types of planets?
�� How do we determine how far apart the How do we determine how far apart the
planets are?planets are?
�� What is the difference between a meteor What is the difference between a meteor
and a meteorite?and a meteorite?
�� What is an asteroid?What is an asteroid?
�� What are comets?What are comets?
�� What are the types of comets?What are the types of comets?
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What are Planets?What are Planets?
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IAU definition of PlanetIAU definition of Planet
� Former definition
• A non-luminous celestial body larger than an asteroid or comet, illuminated by light from a star, such as the sun, around which it revolves.
� A planet is a celestial body that • (a) is in orbit around the Sun,
• (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and
• (c) has cleared the neighbourhood around its orbit.
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What are the Types of Planets?What are the Types of Planets?
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Types of PlanetsTypes of Planets
�� Terrestrial PlanetsTerrestrial Planets
�� Jovian PlanetsJovian Planets
�� Dwarf PlanetsDwarf Planets
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Terrestrial PlanetsTerrestrial Planets
�� Smaller size and massSmaller size and mass
�� Higher densityHigher density
�� Made mostly of rock and metalMade mostly of rock and metal
�� Solid surfaceSolid surface
�� Few, if any, moonsFew, if any, moons
�� No ringsNo rings
�� Closer to the Sun and each otherCloser to the Sun and each other
�� Warmer surfacesWarmer surfaces
�� Mercury, Venus, Earth, MarsMercury, Venus, Earth, Mars
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VideoVideo
�� ““A Spin Around the Solar System: A Spin Around the Solar System:
Our Rocky Neighbors: The Inner Our Rocky Neighbors: The Inner
PlanetsPlanets””
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MercuryMercury
�� Diameter = 4872 kmDiameter = 4872 km
�� Distance to the Sun =57.9 million Distance to the Sun =57.9 million
km km
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VenusVenus
�� Diameter =12 104kmDiameter =12 104km
�� Distance to the Sun = 108.2 million Distance to the Sun = 108.2 million
kmkm
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EarthEarth
�� Diameter =12 756 kmDiameter =12 756 km
�� Distance to the Sun =149.6 million Distance to the Sun =149.6 million kmkm
�� Orbit period = 356.26 daysOrbit period = 356.26 days
�� Orbit speed = 108 000 km/sOrbit speed = 108 000 km/s
�� Axis rotation = 23.93 hoursAxis rotation = 23.93 hours
�� Axis tilt = 23.5Axis tilt = 23.5oo
�� Acceleration = 9.81 m/sAcceleration = 9.81 m/s22
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MarsMars
�� Diameter =6 780 kmDiameter =6 780 km
�� Distance to the Sun =227.9 million Distance to the Sun =227.9 million
kmkm
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Jovian PlanetsJovian Planets
�� Larger size and massLarger size and mass
�� Lower densityLower density
�� Mostly made of hydrogen, helium, and Mostly made of hydrogen, helium, and hydrogen compoundshydrogen compounds
�� No solid surfaceNo solid surface
�� Many moonsMany moons
�� RingsRings
�� Farther from the sun and each otherFarther from the sun and each other
�� Cool temperatures at cloud topsCool temperatures at cloud tops
�� Jupiter, Saturn, Uranus, NeptuneJupiter, Saturn, Uranus, Neptune
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VideoVideo
�� ““A Spin Around the Solar System: A Spin Around the Solar System:
The Outer Planets the Gas GiantsThe Outer Planets the Gas Giants””
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JupiterJupiter
�� Diameter =142 984 kmDiameter =142 984 km
�� Distance to the Sun =778.4 million Distance to the Sun =778.4 million
kmkm
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SaturnSaturn
�� Diameter =120 536 kmDiameter =120 536 km
�� Distance to the Sun =1.4 billion kmDistance to the Sun =1.4 billion km
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UranusUranus
�� Diameter =51 118 kmDiameter =51 118 km
�� Distance to the Sun =2.4 billion kmDistance to the Sun =2.4 billion km
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NeptuneNeptune
�� Diameter =49 532 kmDiameter =49 532 km
�� Distance to the Sun = 4.5 billion kmDistance to the Sun = 4.5 billion km
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Dwarf PlanetsDwarf Planets
�� Pluto, Ceres, ErisPluto, Ceres, Eris
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IAU definition of a Dwarf PlanetIAU definition of a Dwarf Planet
� A "dwarf planet" is a celestial body that
• (a) is in orbit around the Sun,
• (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape2,
• (c) has not cleared the neighbourhood around its orbit, and
• (d) is not a satellite.
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VideoVideo
�� ““A Spin Around the Solar System: A Spin Around the Solar System:
The Small Pieces: Asteroids, Comets, The Small Pieces: Asteroids, Comets,
and and PlutoPluto””
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CeresCeres
�� Diameter = 974.6kmDiameter = 974.6km
�� Distance to the Sun = Distance to the Sun =
413 832 587.5 km413 832 587.5 km
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PlutoPluto
�� Diameter =2 306kmDiameter =2 306km
�� Distance to the Sun =Distance to the Sun =
5 906 376 272km5 906 376 272km
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ErisEris
�� Diameter =2 600kmDiameter =2 600km
�� Distance to the Sun = 67.665AUDistance to the Sun = 67.665AU
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How do we determine how far apart How do we determine how far apart
the planets are?the planets are?
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Bode’s Law•A rough rule that predicts the spacing of the planets in the Solar System
•To find the mean distances of the planets, beginning with the following simple sequence of
numbers:
0 3 6 12 24 48 96 192 384
•With the exception of the first two, the others are simple twice the value of the preceding
number.
•Add 4 to each number:
4 7 10 16 28 52 100 196 388
•Then divide by 10:
0.4 0.7 1.0 1.6 2.8 5.2 10.0 19.6 38.8
PlanetPlanet Actual Distance (AU)Actual Distance (AU) BodeBode’’ss LawLaw
MercuryMercury 0.390.39 0.40.4
VenusVenus 0.720.72 0.70.7
EarthEarth 1.001.00 1.01.0
MarsMars 1.521.52 1.61.6
Jupiter Jupiter 5.205.20 5.25.2
SaturnSaturn 9.549.54 10.010.0
UranusUranus 19.219.2 19.619.6
NeptuneNeptune 30.130.1 38.838.8
Works for
moons
too!
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What is the Difference Between a What is the Difference Between a
Meteor and a Meteorite?Meteor and a Meteorite?
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�� meteoroidmeteoroid is a is a sandsand-- to boulderto boulder--
sized particle of debris in the Solar sized particle of debris in the Solar
SystemSystem
�� meteormeteor is the visible path of a is the visible path of a
meteoroid that enters meteoroid that enters Earth's (or Earth's (or
another body's) atmosphereanother body's) atmosphere
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What is an Asteroid?What is an Asteroid?
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IAU DefinitionIAU Definition
�� (a) orbits the Sun inside the orbit of (a) orbits the Sun inside the orbit of Jupiter Jupiter
�� (b) does not have sufficient mass for (b) does not have sufficient mass for its selfits self--gravity to overcome rigid gravity to overcome rigid body forces so that it assumes a body forces so that it assumes a hydrostatic equilibrium shape (it is hydrostatic equilibrium shape (it is not round shaped), not round shaped),
�� (c) has not cleared the (c) has not cleared the neighbourhood around its orbit, and neighbourhood around its orbit, and
�� (d) is not a satellite.(d) is not a satellite.
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AsteroidsAsteroids�� Small bodies Small bodies
�� Believed to be left over from the beginning of Believed to be left over from the beginning of
the solar system billions of years agothe solar system billions of years ago
�� 100,000 asteroids lie in belt between Mars 100,000 asteroids lie in belt between Mars
and Jupiterand Jupiter
�� Largest asteroids have been given namesLargest asteroids have been given names
�� made of rocky and metallic minerals made of rocky and metallic minerals
�� random shapes random shapes
�� appear more clear than comets appear more clear than comets
when viewed through a telescopewhen viewed through a telescope
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Most asteroids are Most asteroids are
located in two located in two
regions:regions:
••Asteroid beltAsteroid belt
••Orbit of JupiterOrbit of Jupiter…… the the
HildasHildas (the orange (the orange
"triangle" just inside "triangle" just inside
the orbit of Jupiter) the orbit of Jupiter)
and the and the Jovian TrojansJovian Trojans
(green). The group (green). The group
that leads Jupiter are that leads Jupiter are
called the "Greeks" called the "Greeks"
and the trailing group and the trailing group
are called the are called the
"Trojans" "Trojans"
Where are the asteroids?
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Asteroid BeltAsteroid Belt
�� Discovered in 1801Discovered in 1801
�� Previously Previously
predicted by Franz predicted by Franz
XaverXaver Von ZachVon Zach
�� 18011801-- Piazza found Piazza found
CeresCeres
�� OlbersOlbers found Pallas found Pallas
and and VestaVesta
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AsteroidAsteroid BeltBelt
�� The region of space between Mars and Jupiter; The region of space between Mars and Jupiter; about 2.8AUabout 2.8AU
�� Hundreds of thousands of asteroids known. Hundreds of thousands of asteroids known. Probably millions more!Probably millions more!
�� 3 types of asteroid: Carbonaceous, Silicate, 3 types of asteroid: Carbonaceous, Silicate, MetallicMetallic
�� Even the largest object in the belt, Ceres (dwarf Even the largest object in the belt, Ceres (dwarf planet), is too dim to see without aidplanet), is too dim to see without aid
�� Remnants of a planetRemnants of a planet--formation process that formation process that failed due to Jupiterfailed due to Jupiter’’s gravitational pull OR a s gravitational pull OR a planet that was broken apart during a collisionplanet that was broken apart during a collision
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What are Comets?What are Comets?
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CometsComets
�� Small icy bodiesSmall icy bodies
�� Travel past the SunTravel past the Sun
�� Give off gas and dust as they pass byGive off gas and dust as they pass by
�� made of chemical compounds that made of chemical compounds that vaporize when heated vaporize when heated
�� more elliptical (egg) shapedmore elliptical (egg) shaped
�� appear fuzzier than asteroids when appear fuzzier than asteroids when viewed through a telescopeviewed through a telescope
�� grow tails as they get closer to the Sungrow tails as they get closer to the Sun
�� highly elliptical orbitshighly elliptical orbits
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Anatomy of a CometAnatomy of a Comet
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Anatomy of a CometAnatomy of a Comet
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Parts of a CometParts of a Comet
�� Nucleus= main mass of Nucleus= main mass of
ice/frozen gasice/frozen gas
�� Coma = cloud of gas surrounding Coma = cloud of gas surrounding
nucleusnucleus
�� Tail = forms when ice vaporizes Tail = forms when ice vaporizes
as comet approaches Sunas comet approaches Sun
�� Hydrogen cloud = Hydrogen cloud = cloudcloud of gas of gas
that surrounds coma (only some that surrounds coma (only some
comets have these)comets have these)
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http://science.nationalgeographic.com/science/space/solar-system/asteroids-comets-article.html
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Where are the comets?Where are the comets?
Kuiper BeltA large body of small objects orbiting (the short period comets <200 years) the Sun in a radial zone extending outward from the orbit of Neptune (30 AU) to about 100 AU. Pluto maybe the biggest of the KuiperBelt object.
Oort CloudLong Period Comets (period > 200 years) seems to come mostly from a spherical region at about 50,000 AU from the Sun.
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KuiperKuiper BeltBelt
�� Discovered in 1992Discovered in 1992
�� Named for Dutch Astronomer Gerard Named for Dutch Astronomer Gerard
KuiperKuiper, who had , who had PREDICTEDPREDICTED its its
existence in 1951.existence in 1951.
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KuiperKuiper BeltBelt
�� Region beyond Neptune; 30 to over Region beyond Neptune; 30 to over
50AU50AU
�� At least 70,000 small, icy, slowAt least 70,000 small, icy, slow--
moving, objectsmoving, objects
�� Very faint objects because small, far Very faint objects because small, far
and reflect light from Sunand reflect light from Sun
�� A million times fainter than faintest A million times fainter than faintest
we can see with nakedwe can see with naked--eyeeye
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OortOort CloudCloud
�� Hypothetical spherical cloud. No Hypothetical spherical cloud. No
direct observations.direct observations.
�� Proposed by Ernst Proposed by Ernst OpikOpik (1932), Jan (1932), Jan
HenrikHenrik OortOort (1950)(1950)
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OortOort CloudCloud
�� 50,000AU; defines gravitational boundary 50,000AU; defines gravitational boundary of solar systemof solar system
�� Source of longSource of long--period comets (comets that period comets (comets that have an orbit of hundreds or thousands of have an orbit of hundreds or thousands of years)years)
�� Objects composed of ices (water, Objects composed of ices (water, methane, and ammonia)methane, and ammonia)
�� 2 regions: 2 regions: •• outer sphereouter sphere
•• inner discinner disc
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What are the Types of Comets?What are the Types of Comets?
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�� ShortShort--period cometsperiod comets
•• periods of less than 200 years, periods of less than 200 years,
•• are returning as predicted on wellare returning as predicted on well--
known orbits known orbits
�� LongLong--period cometsperiod comets
•• periods of more than 200 yearsperiods of more than 200 years
•• among the brightest have been several among the brightest have been several